最新消息
最新消息


Epoxy resin Civil engineering

By Fourier transform infrared spectroscopy (Fourier transform infrared spectrometer, FT-IR) and other analysis to understand the structure of the steel reinforcement patch epoxy adhesive layer material nature by the temperature change , the high temperature in order to investigate the structure and experienced varying degrees of spread of different spread time affect the safety of concrete structures reinforced after repair of ; experimental results show that there are four main conclusions: ( 1 ) by the TGA and DTA results show that the epoxy material is heated pyrolysis , combustion heat , the material at 150 ℃ to 170 significant weight loss among ℃, leaving only 20% of the total weight of the residual carbide when heated to 500 ℃ . When (2) FT-IR results showed the temperature was elevated from room temperature to 200 ℃, the content of the carboxyl group in the epoxy resin will be significantly increased , the carboxyl functional group (carbonyl group) in the position of the absorption wave number of 1730 to 1710cm-1时most affected by temperature changes significantly due to the oxidation reaction of epoxy resin , and a peroxide to produce the more , the more the temperature displayed by the epoxy resin tends to cracking phenomenon. ( 3 ) Adhesive layer residual shear stress and temperature by the temperature and time spread is inversely proportional to the shear stress at 150 ℃ before it lost about 25%, 200 ℃ impairment of approximately 75% . ( 4 ) After the heat lysis epoxy material , the residual effects of the shear strength of adhesive layers.Epoxy resin Civil engineering